I would suggest that the American Civil War was different than our being the object of terrorists such as Osama Bin-Laden and Jihadist extremists. This isn't quite a war of brother against brother... but then we should not forget that Osama Bin-Laden was an American hero during Afghanistan's war against the Russians. That he turned against America, fostered a terrorist approach to us, and is willing to sacrifice men, women, children, innocent and military alike, puts this group beyond my ability to make historical comments. I just don't see any comparison.